Elijah d



UNITED STATES PATENT OFFICE.

j ELIJAH D. DAVIS, OF BROOKLYN, NEW YORK.

BORING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 253,913, dated February 21, 1882.

Application filed December 15, 1881.

drilling of portable objects'of any and all descriptions with perfect accuracy 'and exactness of alignment at any desired angle, measured and determined with precision by means of fixed scales.

It consists in the construction 0f a simple compact apparatus embracing, first, a table provided with adjustable clamps` to hold the work, mounted upon a suitable bed-plate on an vupright standard which ad mits of' rotation upon its own axis, the table being so pivoted to the standard as to admit of' being inclined at any desired angle an d to be secured at any desired pointofits inclination; second, an arbor adapted to hold and carry a drill, and which is made to rotate in front of the table and to traverse to and from the same in bearing-blocks made adjustable both as to height above and alignmeut with the bed-plate in .standards projecting from the bed-plate, these standards being themselves capable of adjustment as to their distance from the table. v

' In the accompanying drawings, Figure l is a longitudinal section through my improved drill-guide and table; Fig. 2, a top view ofthe same, and Fig. 3 detached plan view of the table.

A is the bed-plate of my device, supported upon legs a a, or otherwise adapted to be secured to a bench or table for support.

B is an upright standard, having a flange or collar, b, adapted to rest upon the bed-plate, and whose lower end, projecting below said ange, passes through a slot, c, in the bedplate, and is clamped and secured bymeans of a lock-nut, C, as shown in Fig. 1. By loosening the nut Cthe standard maybe turned upon its axis, as may be desired.

The margin of the collar b may be graduated (No model.)

and an index-mark be fixed upon the bed-plate, so as to indicate the degree to which the standard has been moved upon its axis from a given point. I contemplate forming a hinged joint in said standard, as at D, Fig. 1, to be locked by means of a nut on the hinge-pin, or by other suitable device, this joint admitting of an inclination of the standard from the perpendicular, if desired.

E is a table, centrally pivoted to the upper end of the standard by mea-ns of a pivot-plate, e, projecting therefrom centrally on its under side at a rightangle thereto, and which passes vinto a slot in the upper end ofthe standard, a

pivot-pin being passed through the side ofthe slot to engage the standard and form a hinge upon which the table is free to tip from a horizontal to a vertical position. A set-screw, d, serves to fix the table at any angle to which it may be thus inclined, and the degree of inclination is noted by means of a scale upon the face of the pivot-plate c (see Fig. 1) and an index-mark on the standard.

F F are uprights. or standards resting upon the bedplatc A, in Vfront of the standard B, in line therewith. These standards are provided `at'their lower ends with pins or bolts ff, adaptelevation by means of pins` or studs H H,project ing centrally therefrom on each side through the transverse slots w w'. (See Fig. 2.) These pins serve as axes or trunnions upon which the blocks may turn, (see dotted lines in Fig. 1,) and the blocks are secured, when in proper position, above the bed-plate and at the desired inclination by means of lock-nuts on the ends of the pins H H.

An arbor or drill-shaft, K, isjournaled in the bearing-blocks, so as to rotate freely therein parallel with the bedplate and inline wi th the standard B, supporting the table C. This shaft hasfree playlongitudinallyin its bearings. The

'two standards F F are connected by means of a coupling-rod, T, extending from the one to IOC f the other, and which is fixed to the one and secured to the other by a set-screw. The forward end of the drill-shaft next to the table is adapted, by means of a suitable socket or clutch, L, to engage and hold any required size or character of bit or drilling-tool. Its rear end is iitted with a crank, or with a pulley, by means of which power is applied thereto to produce its rotation.

The table E is titled with a disk or plate, M, rotating thereon upon a central pivot-pin, l?. This plate is provided with a series of strips, N N, (see Fig. 3,) pivoted to the disk, each upon a central pin, upon which they may be turned to any angle. Upon these pivoted strips N N are tted sliding clamps .R B, ot' substantially the form shown in the drawings, (see Figs. 1 and 2,) which are adapted to traverse back and forth upon each strip, and are secured by means of acentralthumb-screw orclamp-screw,Q Each clamp may thus be fitted at a point nearer to or farther from the center of the table and at any angle with reference thereto.

The rotating plate Misitselt' fixed as required by means of a set-screw or other suitable catch, mf. The use of this rotating plate M may be dispensed with, and the strips for holding and guiding the clamps P P may be fitted on the table itself.

In the use of my device the work or object to be drilled is secured upon the plate M by means of the sliding adjustable clamps P I), which, from their form, their'freedom to rotate upon the axis of the guide-strips N, and their ready adjustment to and from the center ofthe table, are adapted to engage firmly any piece of work of any form whatever in proper position for drilling. The work being secured upon the plate M, the plate is then rotated upon its axis, the table U carrying the plate tipped upon its axis and the standardB carrying the table rotated upon its axis until the Work is brought exactly into proper position and alignment with reference to the drilling-tool fixed in the arbor K required to produce a bore in the desired direction. The plate M, table C, and standard B are then lixed and secured immovably by means of their set-screws. The drillin g-tool carried by the arbor K is also suitably adjusted in height by moving and setting the bearing-blocks G Ghigher or lowerin the slotted standards F F, and is brought in proper prox- `arbor and fdrill, either by hand or by power.

Cams or other forms of catches may be substituted for the nuts and set-screws in xing the clamps and other movable parts of my device.

A single bearing-block or standard of suii'icient depth to afford a long bearing for the arbor may be used as an equivalent for the two blocks F F, arranged as above described.

What I claim as new, and desire tosecure by Letters Patent, is-

l. Thecombinatiomwith asuitable bed-plate, A, and with an arbor, K, adapted to receive and carry a drilling-tool and to traverse longitudinally and rotate freely in adjustable bearings over said bed-plate., of a table, C, for holding the work to be drilled, supported upon a standard, B, upon the bed-plate, and adjusted to tip upon and to turn with said standard to any desired angle in front of the drill, substantially in the manner and for the purpose herein set forth.

2. The combination, with an arbor or drillshaft, K, and with a drill-table, C, adapted to tip and to turn to any angle with the drill, of a plate, M, pivoted centrally to said table to rotate thereon, and itted with retaining or clamping devices for holding the work thereon, substantially in the manner and for the purpose herein set forth.

3. The combination, with the drill-table C and drill-arbor K, of the pivotedstripsNN and the slidin g clamps RR, traversin gupon said strips, adapted for holding the work in position for the drill, substantially in the manner and for the purpose herein set forth.

In testimony whereofI have signed my name to this specification in the presence of two su l)- scribing witnesses.

ELIJAH l). DAVIS.

Witnesses J. F. AcKR, GEO. E. THOMPSON. 

